CDF modulation?

Ongoing discussions regarding other fire dispatching in San Diego County including Heartland, NorthComm, Monte Vista, etc. Topics about general wildland fire scanning are also welcome here.
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w6kru
Posts: 79
Joined: Sat Nov 15, 2008 11:46 am

CDF modulation?

Post by w6kru »

The comm guidelines from the firescope website shows most of the CDF freqs. to be using wide FM modulation? Is that for real? I have volume issues when I set my 396T that way.
SkipSanders
Posts: 165
Joined: Sun Dec 03, 2006 10:12 pm

Re: CDF modulation?

Post by SkipSanders »

'Wide FM' as in, regular old NFM. 'Narrow FM' now means 6.25 KHz channel spacing.

Wide FM to your scanner is FM Broadcast/Non-Digital TV Audio, 75 KHz deviation.
800
Posts: 122
Joined: Sun Oct 08, 2006 4:35 pm
Location: Hanover County, VA

Re: CDF modulation?

Post by 800 »

SkipSanders wrote:'Wide FM' as in, regular old NFM. 'Narrow FM' now means 6.25 KHz channel spacing.

Wide FM to your scanner is FM Broadcast/Non-Digital TV Audio, 75 KHz deviation.
Partially correct [not 6.25 yet]. Narrow in the VHF / UHF community is a 12.5 kHz channel (compared to the existing 25 kHz channels).
The 6.25 kHz efficiency implementation date was postponed indefinitely.

Don
w6kru
Posts: 79
Joined: Sat Nov 15, 2008 11:46 am

Re: CDF modulation?

Post by w6kru »

Thanks Skip. Thanks Don. It looks like I should just set the modulation to FM for these freqs. They aren't wide as in broadcast FM and they aren't narrow either. I searched the owners manual, an online "easy manual", and a couple of reviews for the BW on the WFM, FM, and NFM settings and couldn't find that answer. In hindsight it wouldn't be WFM so FM makes the most sense.
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